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Reports assignment to, or modification of <code>static</code> fields from within an instance method.
<p>Although legal, such assignments are tricky to do
  safely and are often a result of marking fields <code>static</code> inadvertently.</p>
<p><b>Example:</b></p>
<pre><code>
  class Counter {
    private static int count = 0;

    void increment() {
      // Warning: updating a static field
      // from an instance method
      count++;
    }
  }
</code></pre>
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